Koyomimonogatari Episode 3: Koyomi Sand
Episode 3 of 12 of Koyomimonogatari, aired January 23, 2016, 25 minutes. Available with English subtitles and dub where released.
Episode summary
After Oshino leaves the city, Mayoi informs Koyomi about a sand box whose shape resembles a devil and he decides to find out why.